[TechAssist] Re: Sanyo DS 31590,Need PDF of power supply in shutdown
- From: John at Main TV <maintv@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 21 Jun 2003 10:35:58 -0600
The flashing of the bulb in standby may be normal, the standby PS may
not be designed to deliver 40 watts. If you force the PS ( short Q693
base ot gnd) will it stay on? The relay is only for degaussing so it
should go open in a few seconds. The B+ to the horiz should be +130
volts so apparently it is not going to over-voltage protection.
Possibly your micro is going wacky if IC681 output is too high. John.
Ron Miller d.b.a. Country TV wrote:
> Tested with 40 W. light bulb results are: in standby bulb is dim flashing
> at turn on B+ goes to 126.7 and light is bright stays on about 2.5 sec then
> relay drops out back to stand by .Yoke and fly test good.
> Country TV
> Ron Miller
> Inez, TX. 77968
>
> ----- Original Message -----
> From: "John at Main TV" <maintv@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, June 21, 2003 10:56 AM
> Subject: [TechAssist] Re: Sanyo DS 31590,Need PDF of power supply in shut
> down
>
>
>
>>Good morning. Since your PS output is low even in standby I think you
>>have a PS problem. You could remove the HO and replace it with a 40
>>watt light bulb (from C to ground) and then check PS. In the PS check
>>Q601 and Q604. If either is bad change both with the same number (NTE
>>or others may work for testing but they will overheat). Q635, Q695, and
>>D612 (the photo-optic isolator TLP621 or NTE3098) are common problems.
>>Always change these 3 things together. It could be that your PS is not
>>turning on fully. It normally runs in standby at 75-80 volts output.
>>The turn-on signal comes from the micro pin 27 through Q681, Q693 and
>>Q695. If you ground Q693 base that should force the PS full-on. BTW,
>>your model is listed in Sams 4355 and is similar to Sams 4339,4500,
>>4363, 4616, 4404, 4393. Also for your notes IC681 (5v reg near the
>>micro) can cause strange problems if the output is high and shorted
>>zener diodes in the video section are a common problem. John.
>>
>>
>>Ron Miller d.b.a. Country TV wrote:
>>
>>>In standby B+ at HO is 81.3 turn set on drops to 72vdc get slight buzz
>>
> in
>
>>>speakers then click shut down.Can do this 3 times then have to unplug to
>>>reset.Have No SM, flyback and yoke ring good caps in PS area esr good.PS
>>>devices check good on my fluke 87 diode test .
>>> I have Adobe 6 installed, like to fix this one before it turns into a
>>
> DOG.
>
>>>tia
>>>Country TV
>>>Ron Miller
>>>Inez, TX. 77968
>>>
>>>
>>>
>>
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>>
>>
>>--
>>John Mielke
>>Main TV
>>Longmont,Co 80501
>>303 776 6955
>>303 776 0792 fax
>>maintv@xxxxxxxxxxx
>>
>>
>>
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--
John Mielke
Main TV
Longmont,Co 80501
303 776 6955
303 776 0792 fax
maintv@xxxxxxxxxxx
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